<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>浮动注意点</title>
    <style>
    .box {
        width: 900px;
        height: 300px;
        background-color: pink;
        margin: 0 auto;
    }
    .damao { 
        float: left;
        width: 200px;
        height: 200px;
        background-color: purple;

    }
    .ermao {
        /* float: left; */

        width: 200px;
        height: 200px;
        background-color: red;
    }
      
    .sanmao {
        /* float: left; */

         width: 200px;
         height: 200px;
         background-color: skyblue;
    }
    </style>
</head>
<body>
    <div class="box">
    <div class="damao">大毛</div>
    <div class="ermao">二毛</div>
    <div class="sanmao">三毛</div>
</div>
</body>
</html>